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Restructuring and asset impairment charges (Tables)
 12 Months Ended
Dec. 31, 2015
Restructuring Cost and Reserve [Line Items]  
Restructuring and Related Costs [Table Text Block]
The table below provides the activity related to restructuring charges and the remaining liability as of December 31, 2015:

Restructuring obligations at December 31, 2014
 
$
764

Restructuring costs incurred
 
—

Cash payments
 
(764
)
Restructuring obligations at December 31, 2015
 
$
—